Launched to celebrate the company’s 25th Silver Jubilee, the A.C.T. 25 is a precision-engineered reference level tonearm. Constructed from carbon fibre composite, the A.C.T. 25 is one of the world’s lightest, stiffest and most highly optimised tonearms. Combined with the Circle 25 Turntable, the A.C.T. 25 tonearm becomes part of a highly optimised reference level analogue replay system.
The A.C.T. 25 Tonearm geometry has been highly optimised through finite element analysis (FEA) to provide stiffness and damping across the helical, tapered form of the tonearm. The geometry also reduces material use and thus the mass of the assembled tonearm, reducing the mass requirement of the counterweight and subsequently the system overall.
The carbon fibre arm tube terminates into the aluminium eggshell, the geometry of which has been optimised to achieve a maximal stiffness to weight ratio. Residing beneath the egg is a the kinematic bearing, formed by a brass mount which terminates with a brass ball cap holding captive, three 1mm carbon-chrome ball bearings. This creates a high pressure, triangulated frame of reference ensuring that the centre point of the bearing can never change. It is a beautifully simple, yet highly precise and stable design.
Internally the tonearm is wired with silk covered litz wire, terminated with gold plated RCA Phono plugs. Other features include a solid carbon fibre arm board to support the tonearm when not in use.
As the leader in advanced carbon composite engineering in the high-end audio industry, Wilson Benesch provide two tonearm options, the A.C.T. 25 Tonearm and the Nanotube One Tonearm. Both can be fitted to the Circle 25 turntable, or used with a third party turntable.
Design: Helix of 0 / 90 woven carbon fibre moulded into headshell in one piece. Carbon fibre bias plate.
Internal: Silk covered litz wire
External: Star quad 4 × 96 × 0.05 Resseun shield. Core to core 70pf. Resistance 0.108 Ω Termination gold plated RCA phono plugs
Effective mass: 9g
Effective length: 235mm
Mounting distance: 217mm (spindle to pillar)
Cartridge range: 5-16g (assuming a max required tracking force of 2g)
Sorry, there are no reviews for this product yet.